5hp Briggs Outboard Surging Problem

[UtahBoating]

I have a 5hp Briggs I use to push my scanoe. It starts easily and idles great. However when I get up to 40% or more throttle it starts to surge. It revs up then down up then down etc. I thought it may be the carb, but I cleaned it thoroughly and changed the plug and fuel filter. It is still surging. I hooked up an inline spark tester and the spark is consistent at idle, however when I rev it up the spark misses at the same time the engine surges. I am guessing this means I have a spark issue? Maybe a coil? Or could it be timing? Suggestions? Thanks for the input.

 

[Alan H]

Re: 5hp Briggs Outboard Surging Problem

Very first thing put a new spark plug in it. This can cure alot of spark issues on lawn engines. On briggs lawn engines somtimes the key in the crank that holds the flywheel on can be damaged or almost sheered into. Also be sure there is no water in the gas.

 

[Howard Sterndrive]

Re: 5hp Briggs Outboard Surging Problem

when I get up to 40% or more throttle it starts to surge. It revs up then down up then down etc.

it does this traveling down the lake?

Or in neutral?

 

[a70eliminator]

Re: 5hp Briggs Outboard Surging Problem

I was going to mention the governor spring, but then you added the loosing spark issue which throws a different wrench into it.

 

[UtahBoating]

Re: 5hp Briggs Outboard Surging Problem

it does this traveling down the lake?

Or in neutral?

It does it in neutral.

 

[steelespike]

Re: 5hp Briggs Outboard Surging Problem

I think The motor has a rev limiter.If not working right it might surge.

 

[UtahBoating]

Re: 5hp Briggs Outboard Surging Problem

I think The motor has a rev limiter.If not working right it might surge.

Any suggestions on how to check the rev limiter?

 

[Howard Sterndrive]

Re: 5hp Briggs Outboard Surging Problem

It does it in neutral.

then it is 100% normal.

It's supposed to do that. It's defeating your attempt to destroy it.
Briggs 4 strokes are low rpm engines.
Do not mess with the rev limiter. ever.
Go in the lake and have fun with it.

Wear ear plugs.

 

[UtahBoating]

Re: 5hp Briggs Outboard Surging Problem

then it is 100% normal.

It's supposed to do that. It's defeating your attempt to destroy it.
Briggs 4 strokes are low rpm engines.
Do not mess with the rev limiter. ever.
Go in the lake and have fun with it.

Wear ear plugs.

Thank you for the info. I appreciate it. I will take it out in a couple of days and giver her a try.